It adopts the techingue of active current wave-shaping to control continuous conduction of input current. Its switching-cycle is constant, and its conduction time is modulated according to the slope of input current.

• 它采用有源电流波形整形技术 ；控制输入电流连续导通 ；其控制开关的周期是固定的 ；导通时间的大小是根据输入电流的斜率进行调控 .